https://www.diyaudio.com/community/threads/sissysit-p-or-how-i-proved-fact-of-making-more-hats-than-pa-did.385400/#post-7000665
Well, anyone at least partially partial with my omnipresent babbling, knows about endless series of M2 derivatives, I made sorta recently
All of them having M2-like Front End (my biggest Fetish), so entire voltage gain got from autoformer, so no (overall) NFB involved
Also - all of them having second of my recent Fetishes - Square Law OS
Ok, that is line of unnecessary long line of M2 derivatives, difference being that each is having different quirk of OS parts
Then came next fixation point... when I concocted FE for Babelfish XA252, biggest part of invention was proper name for same FE - Plethora of Pinjatas ....... so I ( naturally) came to idea of making second totally unnecessary line of derivatives, now having Plethora of Pinjatas FE, and simply varying already proven SL OS iterations
This line having slightly different ( sorta mirrored/flipped/downundered/whatever) biasing mechanimus, comparing to older specimens, this one directly taken form Babelfish XA252
Comparing to older ones ( having opto between Mosfet Gates and fixed resistors from rails to gates), there are current mirrors from rails to fixed resistor(s) between Mosfet gates; result is better Iq behavior in domain of rails change, same as better Iq behavior in thermal change domain, and also firmer relaxation factor (Iq stability in dynamic domain; think recovery time if change occurs with long large signal)
Anyway, let's ignore Babelfish XA252 as first one, declare SissySIT P (P suffix for Plethora of Pinjatas family) as first one
Am I happy ...... yes! (this one done, so I can think of working on next )
Confirming same amp sound character, for amps made without NFB and with Autoformer gain and amps made with sorta heavy NFB and active gain ....... well, not exactly a novelty per se
this post intentionally made pic-less - in case of later edits, lesser mess